Cisco SPA-1XCHOC12/DS0 network interface processor

The Cisco® I-Flex design combines shared port adapters (SPAs) and SPA interface processors (SIPs) using an extensible design that enables service prioritization for voice, video, and data services. Enterprise and service provider customers can use the improved slot economics resulting from modular port adapters that are interchangeable across Cisco routing platforms. The I-Flex design maximizes connectivity options and offers superior service intelligence through programmable interface processors that deliver line-rate performance. I-Flex enhances speed-to-service revenue and provides a rich set of quality-of-service (QoS) features for premium service delivery while effectively reducing the overall cost of ownership. This data sheet contains the specifications for the Cisco 1-Port Channelized OC12/STM-4 SPA (refer to Figure 1).

The Cisco 1-Port Channelized OC-12/STM-4 SPA is available on high-end Cisco routing platforms offering the benefits of network scalability with lower initial costs and ease of upgrades. The Cisco SPA/SIP portfolio continues the Cisco focus on investment protection along with consistent feature support, broad interface availability, and the latest technology. The Cisco SPA/SIP portfolio allows different interfaces (Packet over SONET/SDH [POS], ATM, Ethernet, etc.) to be deployed on the same interface processor.

Applications
Internet traffic continues to grow at an explosive rate - with the number of users doubling each year. This unsurpassed growth is increasing the demand for higher-capacity interfaces from OC-3/STM-1 to OC-48/STM-16. In addition, POS enables efficient transport of IP traffic and uses SONET/SDH concatenated payloads (that is, STS-3c/VC-4, STS-12c/VC-4-4c, or STS-48c/VC-4-16c) to achieve a higher order of statistical multiplexing. At present, concatenated services at VC-4 rates are available only in some parts of the world (for example, Europe), with higher rates not yet readily available. The new Channelized OC-12/STM-4 SPA provides customers in these areas with an STM-4 POS interface that can be provisioned through the traditional network. The Channelized OC12/STM-4 SPA builds on the SONET/SDH channelization capability.

Features at a Glance
- 1-port Channelized OC-12/STM-4 port per SPA
- SONET VT 1.5 mapping: STS-1<>VTG<>VT1.5<>DS1<>
- SONET PDH-DS-3 (M13 and C-bit) mapping: STS-1<>DS3<>DS1<>nxDS0
- SDH VC-12 mapping (AU-4<>TUG3<>TUG2<>VC-12<>E1<>nxE0
- SDH VC-11 mapping (AU-3<>TUG2<>VC-11<>DS1<>nxDS0)
- SONET DS-3 mapping: STS-1<>DS3 (clear channel)
- SDH DS-3 mapping: AU-4<>TUG3<>VC-3<>DS3 or AU-3<>VC-3<>DS3
- SDH E3 mapping: AU-4<>TUG3<>VC-3<>E3 or AU-3<>VC-3<>E3
- Bit Error Rate Test (BERT) support for T3/E3 channels
- Channelization support for 4 OC-3 or 12 DS-3 or 336 DS-1 or 2K DS-0 or n x DS-0 channels, or any combination of these
- Multilink bundling on T1/E1 channels as per RFC 1990
- Subrate DS-3
- BERT support for T1/E1 channels